Which of the following parental combination has produced mutant offspring?
$Tt × tt = Tt$
$tt × tt = Tt$
$Tt × Tt = tt$
$TT × tt =Tt$
All the sons are haemophilic and daughter are normal of a haemophilic father and normal mother. This character is
Select the incorrect statemant from the following.
Complete dominance is absent in
The sex in Drosophila melanogaster is determined by
In a gene pool, along with beneficial mutations those mutations also exists which are damaging to an individual. It has been found that these mutations are irreversible because
$I.$ they have survival value
$II.$ they are acquired
$III.$ they are recessive and carried by heterozygous individuals only
$IV.$ they show genetic drift
Choose the incorrect option for given statement